Getting Started using Docker

Introduction

These instructions are for users to get and run EdgeX Foundry using the latest stable Docker images.

If you wish to get the latest builds of EdgeX Docker images (prior to releases), then see the EdgeX Nexus Repository guide.

Get & Run EdgeX Foundry

Install Docker & Docker Compose

To run Dockerized EdgeX, you need to install Docker first. See https://docs.docker.com/engine/install/ to learn how to install Docker. If you are new to Docker, the same web site provides you educational information. The following short video is also very informative https://www.youtube.com/watch?time_continue=3&v=VhabrYF1nms

Use Docker Compose to orchestrate the fetch (or pull), install, and start the EdgeX micro service containers. Also use Docker Compose to stop the micro service containers. See: https://docs.docker.com/compose/ to learn more about Docker Compose and https://docs.docker.com/compose/install/linux/ to install it.

You do not need to be an expert with Docker (or Docker Compose) to get and run EdgeX. This guide provides the steps to get EdgeX running in your environment. Some knowledge of Docker and Docker Compose are nice to have, but not required. Basic Docker and Docker Compose commands provided here enable you to run, update, and diagnose issues within EdgeX.

Select a EdgeX Foundry Compose File

After installing Docker and Docker Compose, you need a EdgeX Docker Compose file. EdgeX Foundry has over a dozen micro services, each deployed in its own Docker container. This file is a manifest of all the EdgeX Foundry micro services to run. The Docker Compose file provides details about how to run each of the services. Specifically, a Docker Compose file is a manifest file, which lists:

• The Docker container images that should be downloaded,
• The order in which the containers should be started,
• The parameters (such as ports) under which the containers should be run

The EdgeX development team provides Docker Compose files for each release. Visit the project's GitHub and find the edgex-compose repository. This repository holds all of the EdgeX Docker Compose files for each of the EdgeX releases/versions. The Compose files for each release are found in separate branches. Click on the main button to see all the branches.

The edgex-compose repositor contains branches for each release. Select the release branch to locate the Docker Compose files for each release.

Locate the branch containing the EdgeX Docker Compose file for the version of EdgeX you want to run.

In each edgex-compose branch, you will find several Docker Compose files (all with a .yml extension). The name of the file will suggest the type of EdgeX instance the Compose file will help setup. The table below provides a list of the Docker Compose filenames for the v3.1 version. Find the Docker Compose file that matches:

• your hardware (x86 or ARM)
• your desire to have security services on or off

Download a EdgeX Foundry Compose File

Once you have selected the release branch of edgex-compose you want to use, download it using your favorite tool. The examples below uses wget to fetch Docker Compose for the Ireland release with no security.

wget https://raw.githubusercontent.com/edgexfoundry/edgex-compose/v3.1/docker-compose-no-secty.yml -O docker-compose.yml

wget https://raw.githubusercontent.com/edgexfoundry/edgex-compose/v3.1/docker-compose-no-secty-arm64.yml -O docker-compose.yml

Generate a custom Docker Compose file

The Docker Compose files in the ireland branch contain the standard set of EdgeX services configured to use Redis message bus and include only the Virtual and REST device services. If you need to have different device services running or use MQTT for the message bus, you need a modified version of one of the standard Docker Compose files. You could manually add the device services to one of the existing EdgeX Compose files or, use the EdgeX Compose Builder tool to generate a new custom Compose file that contains the services you would like included. When you use Compose Builder, you don't have to worry about adding all the necessary ports, variables, etc. as the tool will generate the service elements in the file for you. The Compose Builder tool was added with the Hanoi release. You will find the Compose Builder tool in each of the release branches since Hanoi under the compose-builder folder of those branches. You will also find a compose-builder folder on the main branch for creating custom Compose files for the nightly builds.

Do the following to use this tool to generate a custom Compose file:

1. Clone the edgex-compose repository.

git clone https://github.com/edgexfoundry/edgex-compose.git

cd edgex-compose/
git checkout kamakura

cd compose-builder/
make gen ds-mqtt mqtt-broker
  - Generates secure Compose file configured to use MQTT for the message bus, adds then MQTT broker and the Device MQTT services. 

make gen no-secty ds-modbus 
  - Generates non-secure compose file with just the Device Modbus device service.

make gen no-secty arm64 ds-grove 
  - Generates non-secure compose file for ARM64 with just the Device Grove device service.

See the README document in the compose-builder directory for details on all the available options. The Compose Builder is different per release, so make sure to consult the README in the appropriate release branch. See Ireland's Compose Builder README for details on the lastest release Compose Builder options for make gen.

Run EdgeX Foundry

Now that you have the EdgeX Docker Compose file, you are ready to run EdgeX. Follow these steps to get the container images and start EdgeX!

In a command terminal, change directories to the location of your docker-compose.yml. Run the following command in the terminal to pull (fetch) and then start the EdgeX containers.

docker-compose up -d

docker-compose pull
docker-compose up -d

Verify EdgeX Foundry Running

In the same terminal, run the process status command shown below to confirm that all the containers downloaded and started.

docker-compose ps

If all EdgeX containers pulled and started correctly and without error, you should see a process status (ps) that looks similar to the image above. If you are using a custom Compose file, your containers list may vary. Also note that some "setup" containers are designed to start and then exit after configuring your EdgeX instance.

Checking the Status of EdgeX Foundry

In addition to the process status of the EdgeX containers, there are a number of other tools to check on the health and status of your EdgeX instance.

EdgeX Foundry Container Logs

Use the command below to see the log of any service.

# see the logs of a service
docker-compose logs -f [compose-service-name]
# example - core data
docker-compose logs -f data

See EdgeX Container Names for a list of the EdgeX Docker Compose service names.

A check of an EdgeX service log usually indicates if the service is running normally or has errors.

When you are done reviewing the content of the log, select Control-c to stop the output to your terminal.

Ping Check

Each EdgeX micro service has a built-in response to a "ping" HTTP request. In networking environments, use a ping request to check the reach-ability of a network resource. EdgeX uses the same concept to check the availability or reach-ability of a micro service. After the EdgeX micro service containers are running, you can "ping" any one of the micro services to check that it is running. Open a browser or HTTP REST client tool and use the service's ping address (outlined below) to check that is available.

http://localhost:[service port]/api/v3/ping

See EdgeX Default Service Ports for a list of the EdgeX default service ports.

"Pinging" an EdgeX micro service allows you to check on its availability. If the service does not respond to ping, the service is down or having issues.

Consul Registry Check

EdgeX uses the open source Consul project as its registry service. All EdgeX micro services are expected to register with Consul as they start. Going to Consul's dashboard UI enables you to see which services are up. Find the Consul UI at http://localhost:8500/ui.